It is called Season 3 because it was released at the begining of the 3rd Arena Season. Each season lasts an indefinate amount of time and introduces new armor sets.
The prefix of all Season 3 gear is "Vengeful Gladiator's"
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Idol, Totem, Libram; Wand, 2-H Axe (Hunter)
Gloves, Off-hand, Some One-handed weapons (Chopper, Hacker, Bonecracker, Quickblade)
Head, Legs, Chest, Shield
The remaining One-handed weapons (melee) (Shanker, Right Ripper, Cleaver, Pummeler, Slicer)
One-handed weapons (casters)
Two-handed weapons, Ranged Weapons